#wrap_dark {
  transition: all .3s ease-in-out;
  z-index: 1001; 
  position: fixed;
  opacity: .5;
}

#section_1 > .margen {
  background-color: #fff;
  align-content: flex-start; /*center*/
  margin: initial; /*auto*/  
}

#lateral {
  width: 290px;
  height: 100%; 
  position: fixed;
  top: 0px;
  left: 0px;
  transition: left .1s ease; 
  z-index: 1002;
  padding-right: 60px;
  border: 1px solid green;
  border: none;
}

#lateral #para_opciones {
  position: relative;
  background-color: #003b6f;
  padding-top: 85px;
  height: 100%;
  user-select: none;
  overflow-y: auto;
  overflow-x: hidden; /*parche*/
}

/*para los efectos de javascript*/
#lateral #para_opciones .option {
  height: 40px;
  position: relative;
  width: 100%;
  background-color: transparent;
  text-align: left;
  font-size: 1.15em;
}

/*para los efectos hover*/
#lateral #para_opciones .option .back_option {
  position: absolute;
  border-bottom: 1px solid #327699;
  top: 0px;
  left: 0px;
  height: 100%;
  width: 100%;
  color: #fff;
  font-size: 1.05em;
  transition: all .1s ease; 
  padding: 8px;
  cursor: pointer;
}

#lateral #para_opciones .option .back_option:hover {
  background-color: #327699;
}

@media only screen and (min-width: 600px) {
  
  #wrap_dark {
    display: none;
  }
       
}

@media only screen and (min-width: 970px) { 
  
  #section_1 {
		padding-left: 200px;
  }
      
  #section_1 > .margen {
    width: 100%;
    max-width: initial;
  }
  
  #lateral {
    width: 200px; 
    padding-right: initial;
    z-index: initial; /*(1002)*/
    box-shadow: 1px 2px 4px #222;
    top: 60px;
  }
    
}